Exercise bicycle



FIG. 1 is a perspective view of an exercise bicycle showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a left side elevational view thereof, the side opposite being substantially a mirror image; and,

FIG. 6 is an elevational view taken along line 6--6 in FIG. 5 shown in fragment and on an enlarged scale. 

The ornamental design for an exercise bicycle, as shown and described. 